Phase 3.5: Cardinality hints for V2_0 streaming encoder (lance submodule)

Update third_party/lance submodule to include Phase 3.5 changes:
- previous::PrimitiveFieldEncoder gets known_cardinality cached at encoder
  creation; set_cardinality_hint() called in each tokio encode task so
  VariableWidthBlock::cardinality() skips HyperLogLogPlus entirely.
- PrimitiveStructuralEncoder same pattern for V2.1+ consistency.

Perf result: compute_stat 17.7% → ~0.05%, window peaks 300K → 1.7M+ r/s
on SF=5 lineitem zero-copy path.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: tsafin